Draw-off durations are 56 and 47 % of the time below 10 s at washbasins and kitchen sinks, respectively. Temperature measurements at the draw-off points yet show that a significant share of the heat is lost from connection pipes. Above 85 % of the total energy use is lost from the circulation circuit to secure a high hot water temperature close to the draw-off point. This master thesis presents high resolution measurement results in two office and educational buildings, which show that the three DHW systems only utilize 3.4, 5.9, and 7.5 % of the total energy used for DHW production.
To develop more energy efficient DHW systems more knowledge is needed regarding draw-off duration, flow rates, and temperatures from different draw-off types.
With today’s focus on energy efficient buildings, the DHW systems must not be left behind the other fields to get the holistic approach to energy efficient building. As energy use for space heating, ventilation, and lightning has been reduced, the energy share for DHW production has increased. The energy use for domestic hot water (DHW) production in non-residential buildings has in many years been neglected in the research and development of energy efficient buildings.
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